<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>variable</title>
<script type="text/javascript">
	
	//1.变量声明
	var a = 10.1;
	a = "'hello'";
	a = true;
	a = new Date();
	alert(a.toLocaleString());
	//2.变量赋值
	
	//3.变量严格区分大写小写
	
</script>
</head>
<body>

</body>
</html>